Valve-grinding machine



1929. 'T. v. CALDWELL 1,703,921

I L -VALVEGRINDING MACHINE Filed Dec. 17, 1927 2 Sheet s-Sheet 1 A TT ORNE Y.

f; INVENTOR. I W QMWM/ 1'. v CALDWELL VALVE GRINDING MACHINfi Mar. 5, 1929.

Filed Dec. 17, 1927 2 Sheets-Sheet 2 I: v 2. U

MN Q E L INVEN TOR.

A TTORNE Y.

Patented Mar. 5, 1929.

arena-Enos v. CALDWELL, or p'uBors, PENNSYLVANIA.

VALVE-GRINDING MACHINE.

7 "Application filed December This invention relates to a machine for grinding the elements or triple valves c1npiovci' 'n air brake systems, and it has for an objec the provision oi novel means for expeditiously and uniformly grinding the contacting surfaces oi 'the coacting members n a manner to insure proper seating of the valve and the restorationcf the valve to eiiicient condition.

"further object of this invention to provide novel means whereby the slide valve be operated or moved in engagement its seat, means being provided forexert- :e or ibrce on the parts while they motion to insineuniformity of operaiieansa re also provided in association 3 slide valve grinder for lapping in a valve and the mechanisms are cm the same sourceof power. still further object oi this invention uce a valve griiiding machine in which the parts of thevalve to be utilizedduring grinding operation may be expeditiously ed or removed i ronithe machine.

.1 the foregoing and other objects in view, the invention consists in the details of construction, and in the arrangement and combination of parts to be hereinafter more :tully set forth and claimed.

In describing the inventionin detail, reierence will be had to the accompanying drawings forming part of this application, wherein like characters denote corresponding parts in the several views, and in which Figure 1 illustrates a view n elevat on of a grinding machine embodying the invention; e

Figure 2 illustrates a view in elevation of one end of the machine;

Figure 3 illustrates a plan view of said machine, duplicated parts being omitted. I

Figure 4i illustrates a detail View of one oi? the guide members; and

Figure 5 illustrates a detail view of an other guide member. l

in these drawings, denotes a suitable bed plate which is preferably provided with mechanism for grinding two slide valves and two graduating valves, but, as the mechanism for grinding a slide valve and the mechanism for grinding a graduating valve are duplicated, a description of the mechanism for grinding one of theslide valves and one of the graduating valves will, it is thought, he

17,1927. Serial in. 240,759.

sufficient to enable one skilled in the art to practice theinvention. I

'As here shown, the base is provided with bearing brackets or posts 11 in whicha power dr ven shaft 12 is journaledvThe pulley 13 on the shaft 12 maybe driven from any does notwishto belimited, of course, with respect to this detail. hesis 14 andlfi are carried on the shaft nearits ends and each wheel has a wrist pin, such as 16, on which a pitinan 17 .is mounted, and each of the said pitinen is intended to be pivotally connected to a thrust rod or bar l8'which is to be reciprocated preferably in a horizontal plane above the bed plate. Each rod 18 is provided with an aperture 19 to receive a pin 20 by which the slide valve of a tripleyvalve is connected to the rod 18 in order that the slide valve 21 maybe reciprocated on its bushing when a triple valve casing 22 is attached to the base. It is understood, of course, that each pitnian willreciprocate a rod 18 associated withthe triple valvecasing and parts to be. lapped. Eachrod 18 is maintained in operative relation to the valve by-the sectional guides, one of which is located at each end oi the valve casing.

Each guide, in the present embodiment of the invention, comprises a post 23 rising from the bed plate and being provided with a bolt 24 slidable in a slot 25 of said'post 23. The section 26 ofthe post, alsov has a slot 27 coinciding with the slot 25 of the post 23, and the slot 27 receives the bolt 24 to permit an adjustment or" the guiding member 26 vertically and when proper adjustment has been attained, the parts Willbe secured together by the bolt.

In order to insure proper pressure of the slide valve on the bushing while the rod is reciprocating, a spring 28 is connected to the said rod and to an anchor 29 on the base in front of the location of the valve casing, and a spring 30 is connected to the said rod and to an anchor 31 on the base at the rear of the location of the valve casing and it is the'purpose of the inventor that these springs shall yieldingly hold the valve on its bushing while it is being reciprocatcd and that the strength of the springs shall be such thatthe friction of the valve will be augmented to a degree to facilitate the valve lapping operation.

It is shown in the drawing that the base is suitable source of power, and the inventor provided with an annular shoulder 32 which forms a seat for the valve, and the base at 10- cations near the flange-has threaded apertures 33 which receive anchors by which the flange of a valve may be secured to the base to hold the valve casing rigid. lVhen a slide valve is to be lapped, the triple piston of a triple valve is removed from the valve casing by removing the pin which connects the slide valve to the triple piston and when the piston has been removed, the rod 18 is inserted in the valve casing and the pin 20 corresponding to the pin which holds the slide valve to the triple piston is employed for connecting the reciprocating rod tothe slide valve, after which power is applied to drive the grinding machine and the slide valve is reciprocated on its bushing until a leak-proor joint has been formed between the said slide valve and its bushing, after which, of course, the triple valve may be reassembled.

In addition to the mechanism just described, the machine embodies elements which may be employed for grinding the graduating valve. In this additional provision, journal bearings 34 and 35 are located between the posts or bearings 11 and a shaft 36 is journaled in the bearings 34 and 35. A pulley 37 on the shaft 12' and a pulley 38 on the shaft 36 may be connected by a belt 39 in order that the shaft 36 will be driven when the shaft 12 is rotated. Wheels or disks 40 near the ends of the shaft 36 have wrist pins 41 on which pitmen 4-2 are mounted and these pitmen are pivotally connected to reciprocating rods 43 that operate in guides, such as 4A, across the supplemental bed plate 45 which is'intended to hold the slide valve while lapping in the graduating valve, it being stated that the rod 43 is provided with a clip 46 which holds the graduating valve. The operation attending the lapping of the graduating valve is prac tically the same as that for lapping the slide valve, and the reciprocating rod 43 is under tension of a spring 47 which is connected to the said rod and suitably anchored to the base. A recess 48 is formed in the supplemental bed plate 45 to receive the slide valve, and the recess l9 in the supplemental bed plate for the slide valve is different in size from that of the recess 48.

I claim:

1. In a valve grinding machine, a bed plate having a seat for a valve case, a rod adapted to be reciprocated above said seat, said rod having an aperture to-receive the pin of a slide valve whereby the slide valve is connected to move with the said rod, an adjustable guide at the front and rear of said seat, each of said guides comprising a post having a coacting section adjustable vertically, means for holding the parts in adjusted positions, a spring connected to said rod in front of the seat of the valve case, a spring connected to said rod at the rear of the valve case, means for anchoring each of the said springs, and means for reciprocating the rod.

2. In a valve grinding machine, a bed plate having a seat for a valve case, a rod adapted to be reciprocated above said seat, said rod having an aperture to receive the pin of a slide valve whereby the slide valve is connected to move with the said rod, an adjustable guide at the front and rear or said seat, each of said guides comprising a post having a coacting section adjustable vertically, means for holding the parts in adjusted position, means for exerting tension on the rod, means for reciprocating the said rod, a supplemental bed having seats, elements guided approximately horizontally above said seats, means for reciprocating said elements, clips carried by said elements for engaging valve elements for moving said valve elements with respect to other elements seated on the supplemental bed plate, and means for exerting tension downwardly on said elements.

TOBRENCE V. CALDWELL. 

